diff options
Diffstat (limited to 'sysdeps')
| -rw-r--r-- | sysdeps/generic/tls-setup.h | 22 | ||||
| -rw-r--r-- | sysdeps/i386/nptl/tcb-offsets.sym | 1 | ||||
| -rw-r--r-- | sysdeps/i386/nptl/tls.h | 5 | ||||
| -rw-r--r-- | sysdeps/x86/nptl/tls-setup.h | 23 | ||||
| -rw-r--r-- | sysdeps/x86/sysdep.h | 27 | ||||
| -rw-r--r-- | sysdeps/x86_64/nptl/tcb-offsets.sym | 1 | ||||
| -rw-r--r-- | sysdeps/x86_64/nptl/tls.h | 5 |
7 files changed, 82 insertions, 2 deletions
diff --git a/sysdeps/generic/tls-setup.h b/sysdeps/generic/tls-setup.h new file mode 100644 index 0000000000..8d0c36d2b8 --- /dev/null +++ b/sysdeps/generic/tls-setup.h @@ -0,0 +1,22 @@ +/* Definitions to set up thread-local data. Generic version. + Copyright (C) 2018 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +static inline void __attribute__ ((always_inline)) +tls_setup_tcbhead (struct pthread *pd) +{ +} diff --git a/sysdeps/i386/nptl/tcb-offsets.sym b/sysdeps/i386/nptl/tcb-offsets.sym index 7d7fe5e71c..fbac241c45 100644 --- a/sysdeps/i386/nptl/tcb-offsets.sym +++ b/sysdeps/i386/nptl/tcb-offsets.sym @@ -12,3 +12,4 @@ CLEANUP offsetof (struct pthread, cleanup) CLEANUP_PREV offsetof (struct _pthread_cleanup_buffer, __prev) MUTEX_FUTEX offsetof (pthread_mutex_t, __data.__lock) POINTER_GUARD offsetof (tcbhead_t, pointer_guard) +FEATURE_1_OFFSET offsetof (tcbhead_t, feature_1) diff --git a/sysdeps/i386/nptl/tls.h b/sysdeps/i386/nptl/tls.h index afb71ce431..21e23cd809 100644 --- a/sysdeps/i386/nptl/tls.h +++ b/sysdeps/i386/nptl/tls.h @@ -41,7 +41,10 @@ typedef struct uintptr_t stack_guard; uintptr_t pointer_guard; int gscope_flag; - int __glibc_reserved1; + /* Bit 0: X86_FEATURE_1_IBT. + Bit 1: X86_FEATURE_1_SHSTK. + */ + unsigned int feature_1; /* Reservation of some values for the TM ABI. */ void *__private_tm[3]; /* GCC split stack support. */ diff --git a/sysdeps/x86/nptl/tls-setup.h b/sysdeps/x86/nptl/tls-setup.h new file mode 100644 index 0000000000..ef5a4df78c --- /dev/null +++ b/sysdeps/x86/nptl/tls-setup.h @@ -0,0 +1,23 @@ +/* Definitions to set up thread-local data. x86 version. + Copyright (C) 2018 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +static inline void __attribute__ ((always_inline)) +tls_setup_tcbhead (struct pthread *pd) +{ + pd->header.feature_1 = THREAD_GETMEM (THREAD_SELF, header.feature_1); +} diff --git a/sysdeps/x86/sysdep.h b/sysdeps/x86/sysdep.h index afcb7cfd76..976566aa37 100644 --- a/sysdeps/x86/sysdep.h +++ b/sysdeps/x86/sysdep.h @@ -21,6 +21,33 @@ #include <sysdeps/generic/sysdep.h> +/* __CET__ is defined by GCC with Control-Flow Protection values: + +enum cf_protection_level +{ + CF_NONE = 0, + CF_BRANCH = 1 << 0, + CF_RETURN = 1 << 1, + CF_FULL = CF_BRANCH | CF_RETURN, + CF_SET = 1 << 2 +}; +*/ + +/* Set if CF_BRANCH (IBT) is enabled. */ +#define X86_FEATURE_1_IBT (1U << 0) +/* Set if CF_RETURN (SHSTK) is enabled. */ +#define X86_FEATURE_1_SHSTK (1U << 1) + +#ifdef __CET__ +# define CET_ENABLED 1 +# define IBT_ENABLED (__CET__ & X86_FEATURE_1_IBT) +# define SHSTK_ENABLED (__CET__ & X86_FEATURE_1_SHSTK) +#else +# define CET_ENABLED 0 +# define IBT_ENABLED 0 +# define SHSTK_ENABLED 0 +#endif + #ifdef __ASSEMBLER__ /* Syntactic details of assembler. */ diff --git a/sysdeps/x86_64/nptl/tcb-offsets.sym b/sysdeps/x86_64/nptl/tcb-offsets.sym index be63404a16..387621e88c 100644 --- a/sysdeps/x86_64/nptl/tcb-offsets.sym +++ b/sysdeps/x86_64/nptl/tcb-offsets.sym @@ -12,6 +12,7 @@ MUTEX_FUTEX offsetof (pthread_mutex_t, __data.__lock) MULTIPLE_THREADS_OFFSET offsetof (tcbhead_t, multiple_threads) POINTER_GUARD offsetof (tcbhead_t, pointer_guard) VGETCPU_CACHE_OFFSET offsetof (tcbhead_t, vgetcpu_cache) +FEATURE_1_OFFSET offsetof (tcbhead_t, feature_1) -- Not strictly offsets, but these values are also used in the TCB. TCB_CANCELSTATE_BITMASK CANCELSTATE_BITMASK diff --git a/sysdeps/x86_64/nptl/tls.h b/sysdeps/x86_64/nptl/tls.h index 65c0051dcf..f042a0250a 100644 --- a/sysdeps/x86_64/nptl/tls.h +++ b/sysdeps/x86_64/nptl/tls.h @@ -51,7 +51,10 @@ typedef struct uintptr_t stack_guard; uintptr_t pointer_guard; unsigned long int vgetcpu_cache[2]; - int __glibc_reserved1; + /* Bit 0: X86_FEATURE_1_IBT. + Bit 1: X86_FEATURE_1_SHSTK. + */ + unsigned int feature_1; int __glibc_unused1; /* Reservation of some values for the TM ABI. */ void *__private_tm[4]; |